A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

A federal judge sentenced a former Arkansas judge Wednesday to five years in prison — a stiffer punishment than prosecutors recommended — after he admitted giving young male defendants lighter sentences in return for personal benefits that included sexual favours.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

In a 60 Minutes online exclusive, reporter Liz Hayes quizzed Australian Prime Minister Malcolm Turnbull on his relationship with the unpredictable Twitter aficionado and US president Donald Trump ahead of their meeting at the White House Friday.

Liberals' fake news plan ironic: WA Labor

WA Labor says it is ironic given the Liberals' track record that the party is urging people to report the opposition's social media posts that are fake or misleading in the lead-up to the March election.

The Liberals posted on their website a five-step guide for Facebook users titled How To Report A Fake Story, claiming Labor had a history of running misleading advertising and had lied about Liberal policy on issues including skilled migration and power prices.

But shadow treasurer Ben Wyatt said there was a "sense of irony" with the state government asking people to dob in Labor's lies when they had deceived the public.

"I think every West Australian remembers fully the fully-funded, fully-costed election lie from Colin Barnett in the 2013 election where all these promises were fully-funded, fully-costed and in the end they weren't," he told reporters on Tuesday.

"I think we can all really have a sense of mirth about the Liberal party going down that path."